:root {
  --bg: #ffffff;
  --ink: #17181c;
  --muted: #6b7280;
  --line: #e6e8ec;
  --accent: #1a56db;
  --max: 920px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.wrap { width: min(var(--max), 100% - 2.5rem); margin-inline: auto; }

/* ---------- top bar ---------- */
.topbar { background: #fff; border-bottom: 1px solid var(--line); }
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; min-height: 60px; flex-wrap: wrap;
}
.brand {
  display: inline-block;
  color: var(--ink); font-weight: 600;
}
.brand:hover { text-decoration: none; }
.nav { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.nav a { color: var(--muted); font-size: .92rem; }
.nav a:hover { color: var(--ink); text-decoration: none; }
.nav a.active { color: var(--ink); font-weight: 600; }

/* ---------- hero ---------- */
.hero { padding: 4.5rem 0 3rem; }
.eyebrow {
  margin: 0 0 .9rem; color: var(--muted);
  font-size: .75rem; letter-spacing: .16em; text-transform: uppercase;
}
.hero h1 {
  margin: 0; font-size: clamp(1.9rem, 4.2vw, 2.7rem);
  line-height: 1.3; letter-spacing: -.01em;
}
.lede { max-width: 38rem; margin: 1.1rem 0 0; color: var(--muted); }
.hero-actions { display: flex; align-items: center; gap: 1.4rem; flex-wrap: wrap; margin-top: 1.9rem; }

.btn {
  display: inline-block; padding: .55rem 1.1rem;
  border: 1px solid var(--ink); border-radius: 2px;
  font-size: .9rem; color: var(--ink);
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #000; }
.btn-ghost:hover { background: #f5f6f8; }
.link-more { font-size: .9rem; }

/* ---------- sections ---------- */
.section { padding: 2.75rem 0; border-top: 1px solid var(--line); }
.section-head { margin-bottom: 1.5rem; }
.section-title { margin: 0; font-size: 1.15rem; font-weight: 600; }
.section-sub { margin: .4rem 0 0; color: var(--muted); font-size: .9rem; }

.rows { border-top: 1px solid var(--line); }
.row {
  display: grid; grid-template-columns: 13rem minmax(0, 1fr);
  gap: 1.5rem; padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}
.row h3 { margin: 0; font-size: .98rem; font-weight: 600; }
.row p { margin: 0; color: var(--muted); font-size: .92rem; }

.join { border-top: 1px solid var(--line); padding: 2.75rem 0; }
.join h2 { margin: 0 0 .6rem; font-size: 1.15rem; }
.join p { max-width: 40rem; margin: 0; color: var(--muted); }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 1.6rem 0 2.5rem;
  color: var(--muted); font-size: .84rem;
}
.footer-inner { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer a { color: var(--muted); }

/* ---------- article (charter) ---------- */
.page-head { padding: 2.5rem 0 1.5rem; border-bottom: 1px solid var(--line); }
.crumbs { margin: 0 0 .5rem; font-size: .82rem; color: var(--muted); }
.crumbs a { color: var(--muted); }
.page-head h1 { margin: 0; font-size: clamp(1.5rem, 3vw, 2rem); }
.page-head p { margin: .5rem 0 0; color: var(--muted); font-size: .9rem; }

.doc-layout {
  display: grid; grid-template-columns: 11rem minmax(0, 1fr);
  gap: 3rem; padding: 2.75rem 0 3rem; align-items: start;
}
.toc {
  position: sticky; top: 80px;
  padding-left: 1rem; border-left: 1px solid var(--line);
  font-size: .88rem;
}
.toc strong {
  display: block; margin-bottom: .5rem;
  font-size: .72rem; font-weight: 600; letter-spacing: .12em; color: var(--muted);
}
.toc ul { margin: 0; padding: 0; list-style: none; }
.toc li { margin: .28rem 0; }
.toc a { color: var(--muted); }
.toc a:hover { color: var(--ink); text-decoration: none; }

.doc h1 { margin: 0 0 1rem; font-size: 1.8rem; }
.doc h2 {
  margin: 2.2rem 0 .8rem; padding-bottom: .35rem;
  font-size: 1.18rem; font-weight: 600;
  border-bottom: 1px solid var(--line);
}
.doc h3 { margin: 1.4rem 0 .4rem; font-size: 1rem; }
.doc p { margin: .7rem 0; }
.doc ul, .doc ol { margin: .7rem 0; padding-left: 1.3rem; }
.doc li { margin: .3rem 0; }
.doc blockquote {
  margin: 1rem 0; padding: .1rem 0 .1rem 1rem;
  border-left: 2px solid var(--line); color: var(--muted);
}
.doc blockquote p { margin: .35rem 0; }
.doc hr { margin: 2rem 0; border: 0; border-top: 1px solid var(--line); }
.doc table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: .9rem; }
.doc th, .doc td {
  padding: .5rem .6rem; border-bottom: 1px solid var(--line);
  text-align: left; vertical-align: top;
}
.doc th { color: var(--muted); font-size: .82rem; font-weight: 600; letter-spacing: .03em; }
.doc code { background: #f4f5f7; padding: .1rem .3rem; font-size: .88em; }
.doc pre { background: #f4f5f7; padding: 1rem; overflow: auto; }
.doc pre code { background: none; padding: 0; }

@media (max-width: 780px) {
  .doc-layout { grid-template-columns: 1fr; gap: 1.5rem; }
  .toc { position: static; }
  .row { grid-template-columns: 1fr; gap: .2rem; }
}

/* ---------- 动态 / 服务 / 后台 ---------- */
button.btn { background: #fff; cursor: pointer; font-family: inherit; }
button.btn:hover { background: #f5f6f8; }
button.btn-primary { background: var(--ink); color: #fff; }
button.btn-primary:hover { background: #000; }
.btn-sm { padding: .32rem .7rem; font-size: .82rem; }
.btn-danger { border-color: #dc2626; color: #dc2626; }
.btn-danger:hover { background: #fef2f2; }

.news-list { border-top: 1px solid var(--line); }
.news-item { padding: 1.2rem 0; border-bottom: 1px solid var(--line); }
.news-item h3 { margin: 0 0 .35rem; font-size: 1rem; }
.news-meta { display: flex; align-items: center; gap: .6rem; margin-bottom: .5rem; color: var(--muted); font-size: .8rem; }
.news-body { margin: 0; color: var(--muted); font-size: .94rem; white-space: pre-wrap; }
.badge { padding: .05rem .45rem; border: 1px solid var(--line); font-size: .72rem; color: var(--muted); }

.empty { padding: 1.75rem 0; color: var(--muted); font-size: .92rem; }

.form { max-width: 34rem; }
.field { margin-bottom: 1rem; }
.field label { display: block; margin-bottom: .3rem; font-size: .88rem; }
.field input, .field select, .field textarea {
  width: 100%; padding: .5rem .6rem; font: inherit; font-size: .92rem;
  color: var(--ink); background: #fff;
  border: 1px solid var(--line); border-radius: 2px;
}
.field textarea { min-height: 6.5rem; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--ink);
}
.form-actions { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.hint { color: var(--muted); font-size: .82rem; }

.msg { margin: 1rem 0; padding: .6rem .85rem; font-size: .88rem; border-left: 2px solid var(--line); background: #f7f8fa; }
.msg-ok { border-color: #16a34a; background: #f3fbf5; }
.msg-err { border-color: #dc2626; background: #fdf4f4; }

.data-table { width: 100%; border-collapse: collapse; font-size: .88rem; }
.data-table th, .data-table td { padding: .45rem .55rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.data-table th { color: var(--muted); font-size: .8rem; font-weight: 600; white-space: nowrap; }
.table-wrap { overflow-x: auto; }

.panel { border: 1px solid var(--line); padding: 1.25rem; margin-bottom: 1.75rem; }
.panel h2 { margin: 0 0 1rem; font-size: 1.02rem; }
.toolbar { display: flex; align-items: center; gap: .7rem; flex-wrap: wrap; margin-bottom: .9rem; }
.toolbar .spacer { flex: 1 1 auto; }
.count { color: var(--muted); font-size: .88rem; }
.admin-item { display: flex; justify-content: space-between; gap: 1rem; padding: .7rem 0; border-bottom: 1px solid var(--line); }
.admin-item:last-child { border-bottom: 0; }
.admin-item h4 { margin: 0 0 .2rem; font-size: .92rem; }
.admin-item p { margin: 0; color: var(--muted); font-size: .85rem; white-space: pre-wrap; }

.page-body { padding: 2.25rem 0 3rem; }